166565383 has 2 divisors, whose sum is σ = 166565384. Its totient is φ = 166565382.

The previous prime is 166565339. The next prime is 166565389. The reversal of 166565383 is 383565661.

It is a strong prime.

It is an emirp because it is prime and its reverse (383565661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166565383 - 2¹⁷ = 166434311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166565389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83282691 + 83282692.

It is an arithmetic number, because the mean of its divisors is an integer number (83282692).

Almost surely, 2^166565383 is an apocalyptic number.

166565383 is a deficient number, since it is larger than the sum of its proper divisors (1).

166565383 is an equidigital number, since it uses as much as digits as its factorization.

166565383 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 388800, while the sum is 43.

The square root of 166565383 is about 12906.0211916764. The cubic root of 166565383 is about 550.2097084602.

The spelling of 166565383 in words is "one hundred sixty-six million, five hundred sixty-five thousand, three hundred eighty-three".